that first error was from admin.php after login attempt.
I get an error on loading index.php also:
Fatal error: Call to a member function on a non-object in /index.php on line 59

index.php debug report

Debug messages
memory | timer | vars

memory:
Len of serialized $cache_imgsize: 2
Len of serialized $cache_File: 2

timer:
Starting timer total
Starting timer _main.inc
Starting timer sql_queries

vars:
Getting ReqURI from REQUEST_URI
$ReqHost: http://XXX.XXXXXX.XXX
$ReqURI: /
$ReqPath: /